There is a lot of material online about the NSA supposedly introducing deliberately flawed algorithms. The most serious of that material has been held back, even by Snowden.
Speaking of fallacious arguments: it's not possible to know that some material has been witheld, and that simultaneously this is known to be the most serious. By trying to make that statement sound more terrifying, you've revealed that you're making rhetorical arguments, not factual arguments.
FWIW, I'm not speaking from a position where I believe bitcoin is without any kind of dishonest influences, despite no solid facts existing to the contrary (you were asked to present some, to which you instead speculated again). But your position is one big contradiction. If the NSA or whoever are using their resources to develop cryptocurrency, it should be pretty clear from the way bitcoin has played out that they have serious intentions. I doubt anything or anyone could prevent their intended goal (whatever that is), these sorts of organisations have access to the kind of resources that no-one can challenge.